Which of the following is true regarding the bronchi?

The statement about the bronchi having cartilaginous walls to prevent collapse is accurate. The bronchi are the large air passages that branch off from the trachea and lead into each lung. Their structure includes cartilage in the form of C-shaped rings, which provides the necessary support to keep the airways open, ensuring that air can flow freely into the lungs during respiration.

This cartilaginous reinforcement is crucial because the bronchi are subject to changes in pressure as air moves in and out, and without this structural integrity, they could easily collapse, hindering airflow. It also allows the bronchi to maintain flexibility, accommodating changes in the surrounding tissues while still protecting the airway.

In contrast, while the bronchi are part of the respiratory system, they are not solely involved in gas exchange, as gas exchange primarily occurs in the alveoli, the tiny air sacs in the lungs. Additionally, although the bronchi are a key part of the respiratory system, they do not fall under the classification of the respiratory division; instead, they are part of the conducting zone, which is responsible for moving air to the sites of gas exchange.